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Association for Computing Machinery


Latest Content From Association for Computing Machinery

Whitepaper: Ajax Live Regions: Chat as a Case Example

by Association for Computing MachineryJan 01, 2008

Web 2.0 enabled by the Ajax architecture has given rise to a new level of user interactivity through web browsers. Many new and extremely popular Web applications have been introduced such as Google Maps, Google Docs, Flickr, and so on. Unfortunately, the accessibility support in most toolkits and Ajax applications overall is lacking. WAI-ARIA markup for live regions presents a solution to making these applications accessible. This white paper presents a chat example that shows the live regions


Whitepaper: Mobile Traffic Sensor Network Versus Motion-MIX: Tracing and Protecting Mobile Wireless Nodes

by Association for Computing MachineryJan 01, 2008

This paper focuses Association for Computing Machinery on passive attacks that threaten the privacy of mobile wireless networks. The company defines the concept of venue privacy attack (VPA) to illustrate the emerging anonymity attacks to trace mobile wireless nodes. Then the company proposes motion-MIX as the countermeasure to defend against various venue privacy attacks. The company studies the necessary conditions to implement motion- MIXes. These conditions include identity-free routing,


Whitepaper: Context- and Path-Sensitive Memory Leak Detection

by Association for Computing MachineryJan 01, 2008

Languages with explicit memory management require the programmer to manually deallocate memory blocks that are no longer needed by the program, and memory leaks are a common problem in code written in such languages. This research paper present a context- and path-sensitive algorithm for detecting memory leaks in programs with explicit memory management. The leak detection algorithm is based on an underlying escape analysis: any allocated location in a procedure P that is not deallocated in P


Whitepaper: Composable XML Integration Grammars

by Association for Computing MachineryJan 01, 2008

The proliferation of XML as a standard for data representation and exchange in diverse, next-generation Web applications has created an emphatic need for effective XML data-integration tools. In this paper, the authors proposes a novel formalism, XML Integration Grammars (XIGs), for specifying DTD-directed integration of XML data. Abstractly, an XIG maps data from multiple XML sources to a target XML document that conforms to a predefined DTD. An XIG extracts source XML data via queries


Whitepaper: Local Approximation Schemes for Ad Hoc and Sensor Networks

by Association for Computing MachineryJan 01, 2008

Wireless ad hoc and sensor networks consist of autonomous devices communicating via radio. There is no central server or common infrastructure which could be used for the organization of the network. The coordination necessary for efficient communication has to be carried out by the nodes themselves. That is, the nodes have to build up a communication service by applying a distributed algorithm. In this paper, numerous proposals to structure wireless networks have been presented.


Whitepaper: Do Security Toolbars Actually Prevent Phishing Attacks?

by Association for Computing MachineryJan 01, 2008

This paper published by Association for Computing Machinery describes about the Security toolbars in a web browser that shows security-related information about a website to help users detect phishing attacks. The authors conducted two user studies of three security toolbars and other browser security indicators and found them all ineffective at preventing phishing attacks. The authors found that many subjects do not understand phishing attacks or realize how sophisticated such attacks can be.


Whitepaper: A Message Ferrying Approach for Data Delivery in Sparse Mobile Ad Hoc Networks

by Association for Computing MachineryJan 01, 2008

Mobile Ad Hoc Networks (MANETs) are multi-hop networks in which wireless mobile nodes cooperate to maintain network connectivity and perform routing functions. MANETs provide rapidly deployable and self-configuring network capacity required in many critical applications, e.g., battlefields, disaster relief and wide area sensing. This paper studies the problem of efficient data delivery in sparse MANETs where network partitions can last for a significant period. Previous approaches rely on the


Whitepaper: Practical Routing in Delay-Tolerant Networks

by Association for Computing MachineryJan 01, 2008

In this research paper the authors present a practical routing protocol that only uses observed information about the network. A metric is designed that estimates how long a message will have to wait before it can be transferred to the next hop. The topology is distributed using a link-state routing protocol, where the link-state packets are ""flooded"" using epidemic routing. The routing is recomputed when connections are established. Messages are exchanged if the topology suggests that a


Whitepaper: Experimental Evaluation of TCP Performance and Fairness in an 802.11e Test-Bed

by Association for Computing MachineryJan 01, 2008

This paper presents measurements made using an 802.11e wireless testbed. The researchers demonstrate experimentally how the new 802.11e QoS parameters behave in their testbed. They describe the testing methodology used to validate the operation of the 802.11e TXOP, AIFS and CWmin parameters and compare the experimental results to existing analytical models. This paper also discusses a number of practical issues encountered during measurements.


Whitepaper: Deeply Embedded XML Communication - Towards an Interoperable and Seamless World

by Association for Computing MachineryJan 01, 2008

eXtensible Markup Language (XML) Web Services were conceived to solve the e-business interoperation problem. After decades of failed attempts with EDI, SNA, DCOM, CORBA, and other similar technologies, XML and its communication specification SOAP has proven itself to be a viable technology. If XML is good for e-business, could it also be good for embedded systems communication? It is argued that XML and SOAP indeed can be useful in small devices. New unique challenges, such as heterogeneous